Bennu could hit Earth with the power of 76,000 WW2 nuclear bombs and create 20km fireball

If Bennu, which NASA is currently studying via its OSIRIS-Rex spacecraft which arrived there in the December, were to hit Earth, it would likely strike the planet at 7000 metres per second – a standard speed asteroids hit at thanks to Earth’s gravitational pull. The speed translates to a staggering 25 MILLION kph.

Weighing a staggering 78bn kilograms and travelling at hyperspeeds would create an explosion...